东昆仑造山带拉陵灶火中游博武斑岩钼矿成因与找矿潜力
发布时间：2018-09-04 12:52
【摘要】：斑岩型钼矿床的最大特点是品位较低,但成矿规模较大,其中的辉钼矿主要呈细脉状或者浸染状赋存于中、酸性的含矿岩体中。其资源量和工业利用量在全球总储量和总利用量中的地位是极其重要的。近年来,青海省地质调查研究院在东昆仑造山带拉陵灶火中游一带发现了典型的斑岩型钼多金属矿床,而在该矿区的东南方向亦发现了钼矿化蚀变,随即环绕该区出露的博武斑岩体展开研究工作,此次研究区内的岩石组合系统可划分三大类:为花岗斑岩类、闪长岩类、变质岩类。含矿岩体主要斑状正长花岗岩与多斑斑状花岗岩,辉钼矿呈细脉浸染状赋存在其中。斑状正长花岗岩与多斑斑状花岗岩的地球化学特征显示其为一套弱过铝质的高钾钙碱性花岗岩,是由于同碰撞作用导致的加厚地壳上部重新熔融而形成S型花岗岩。而灰黑色花岗斑岩则为一套钙碱性花岗岩,该花岗岩组构及物质来源与含矿岩体明显不同;灰黑色花岗斑岩Nb/Ta平均值13.07×10-6,其中最大值为15.26×10-6,Rb/Sr值H9样品为0.19×10-6、H11为0.22×10-6比值介于地幔比值地壳比值之间,Zr/Hf比值远远低于地幔源岩石的Zr/Hf比值,其总体特征显示了与含矿岩体的不同。斑状正长花岗岩与多斑斑状花岗岩为博武岩体斑岩型钼矿的含矿岩体,是陆陆碰撞环境下熔融了地壳而形成的S型高钾钙碱性花岗岩,两者的地球化学、锆石U-Pb年龄等特征相似,为同源演化,其结构的不同主要是由于在岩浆房中所赋存位置的不同而形成在。LA-ICP-MS锆石U-Pb测年所获得的加权平均年龄分别为216.1±3.0Ma、216.1±2.4Ma。博武岩体斑岩型钼矿形成的碰撞时期是在晚三叠世卡尼阶,大约在222Ma左右。区内共发生了两次成矿作用,一次是同碰撞成矿作用,即碰撞过程中由于俯冲板片断离诱发的拆沉作用,这一期次形成的辉钼矿以浸染状形式存在于岩体中,推测形成年龄为222Ma;第二次后碰撞成矿作用,即岩石圈的拆沉作用导致,这一期次形成的辉钼矿以含辉钼矿石英的脉形式存在于岩体中,两期成矿作用均为透岩浆流体成矿作用。经此次研究工作,最终认为博武斑岩型钼矿在矿床类型上属于深成侵入体型斑岩钼矿,且经历了两次辉钼矿的积淀过程,找矿潜力巨大。
[Abstract]:The porphyry molybdenum deposit is characterized by its low grade but large metallogenic scale, in which molybdenum occurs mainly in the form of veinaceous or disseminated ore bodies and acidic ore-bearing rocks. The status of resources and industrial utilization in the global total reserves and total utilization is extremely important. In recent years, the Qinghai Provincial Geological Survey Institute has found typical porphyry molybdenum polymetallic deposits in the middle reaches of the Laling Zaohuo Orogen of the East Kunlun orogenic belt, and molybdenum mineralization and alteration have also been found in the southeast direction of the ore area. The rock assemblage system in this study area can be divided into three categories: granitic porphyry diorite metamorphic rock. The ore-bearing bodies are mainly porphyry syenite and polyporphyritic granites, in which molybdenum occurs in the form of veinlet dipping. The geochemical characteristics of porphyry syenite and polyporphyritic granites show that they are a set of weak peraluminous calc-alkaline granites, which formed S-type granites due to the remelting of the upper part of the thickened crust caused by the simultaneous collision. The gray-black granitic porphyry is a set of calc-alkaline granite, the fabric and material source of the granite is obviously different from the ore-bearing rock mass. The average Nb/Ta value of gray-black granitic porphyry is 13.07 脳 10 ~ (-6), in which the maximum value is 15.26 脳 10 ~ (-6) Rb / Sr value H _ 9 sample is 0.19 脳 10 ~ (-6) H _ (11) ratio is 0.22 脳 10 ~ (-6) ratio is between mantle ratio crust ratio and Zr/Hf ratio of mantle source rock, its general characteristics show that it is different from ore-bearing rock body. Porphyry syenite and polyporphyry granites are ore-bearing bodies of porphyry molybdenum deposits in Bowu pluton. They are S-type high-potassium calc-alkaline granites formed by melting the crust in continental collision environment. The U-Pb age of zircon is similar, which is homologous evolution. The difference in structure is mainly due to the different location of zircon in magma chamber. The weighted mean age obtained by U-Pb dating of zircon from LA-ICP-MS is 216.1 卤3.0 Ma ~ 216.1 卤2.4 Ma. respectively. The collision period of porphyry molybdenum deposit in Bowu pluton occurred in the late Triassic Carney stage, about 222Ma. There are two metallogenic processes in the area, one of which is syncollision mineralization, that is, during the collision, the molybdenum ore formed in this stage exists in the rock mass in the form of dipping, which is caused by the detachment of subduction plate. It is assumed that the age of formation is 222Ma.The second post-collision mineralization, that is, the desilting of lithosphere, resulted in molybdenum deposit in the form of molybdenum bearing quartz vein in the rock mass, and the mineralization in both stages is permeable magmatic fluid mineralization. Through this research work, it is concluded that Bowu porphyry molybdenum deposit belongs to deep intrusive porphyry molybdenum ore deposit type, and has experienced two molybdenum deposit accumulation process, and the prospecting potential is great.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.65
[Abstract]:The porphyry molybdenum deposit is characterized by its low grade but large metallogenic scale, in which molybdenum occurs mainly in the form of veinaceous or disseminated ore bodies and acidic ore-bearing rocks. The status of resources and industrial utilization in the global total reserves and total utilization is extremely important. In recent years, the Qinghai Provincial Geological Survey Institute has found typical porphyry molybdenum polymetallic deposits in the middle reaches of the Laling Zaohuo Orogen of the East Kunlun orogenic belt, and molybdenum mineralization and alteration have also been found in the southeast direction of the ore area. The rock assemblage system in this study area can be divided into three categories: granitic porphyry diorite metamorphic rock. The ore-bearing bodies are mainly porphyry syenite and polyporphyritic granites, in which molybdenum occurs in the form of veinlet dipping. The geochemical characteristics of porphyry syenite and polyporphyritic granites show that they are a set of weak peraluminous calc-alkaline granites, which formed S-type granites due to the remelting of the upper part of the thickened crust caused by the simultaneous collision. The gray-black granitic porphyry is a set of calc-alkaline granite, the fabric and material source of the granite is obviously different from the ore-bearing rock mass. The average Nb/Ta value of gray-black granitic porphyry is 13.07 脳 10 ~ (-6), in which the maximum value is 15.26 脳 10 ~ (-6) Rb / Sr value H _ 9 sample is 0.19 脳 10 ~ (-6) H _ (11) ratio is 0.22 脳 10 ~ (-6) ratio is between mantle ratio crust ratio and Zr/Hf ratio of mantle source rock, its general characteristics show that it is different from ore-bearing rock body. Porphyry syenite and polyporphyry granites are ore-bearing bodies of porphyry molybdenum deposits in Bowu pluton. They are S-type high-potassium calc-alkaline granites formed by melting the crust in continental collision environment. The U-Pb age of zircon is similar, which is homologous evolution. The difference in structure is mainly due to the different location of zircon in magma chamber. The weighted mean age obtained by U-Pb dating of zircon from LA-ICP-MS is 216.1 卤3.0 Ma ~ 216.1 卤2.4 Ma. respectively. The collision period of porphyry molybdenum deposit in Bowu pluton occurred in the late Triassic Carney stage, about 222Ma. There are two metallogenic processes in the area, one of which is syncollision mineralization, that is, during the collision, the molybdenum ore formed in this stage exists in the rock mass in the form of dipping, which is caused by the detachment of subduction plate. It is assumed that the age of formation is 222Ma.The second post-collision mineralization, that is, the desilting of lithosphere, resulted in molybdenum deposit in the form of molybdenum bearing quartz vein in the rock mass, and the mineralization in both stages is permeable magmatic fluid mineralization. Through this research work, it is concluded that Bowu porphyry molybdenum deposit belongs to deep intrusive porphyry molybdenum ore deposit type, and has experienced two molybdenum deposit accumulation process, and the prospecting potential is great.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.65
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